This is my 10th gun mount purchased from Spartan. (shotguns, AR’s, pistols) All of the previous ones fit and worked perfect. Ordered the Rock Island VR80 AR-12 mount this time. Description stated it is supposed to also fit my gun which is a Typhoon F12. Tried to install mount and noticed shotgun’s mag latch/release wouldn’t catch into the notches provided. The latch sits in a recessed channel so very little of latch actually sticks out into the magwell. The mounts design is completely flat on both sides and due to the normal tolerances/space between the outer thickness of the mount and the ID of the magwell the gun would not stay locked in. Sent an email to customer service with pictures and measurements. Ben contacted me the very next morning with an alternative design and offered to ship the new mount immediately free of charge! Received it a few days later and it works perfect. All I can say is that these things happen sometimes. Gun manufactures and aftermarket parts both have accepted tolerance ranges. Just lucked out and this mount with this gun barely missed the mark. But having a fast, no hassle, no cost, customer service response to fix the problem makes all the difference in my book. Also I rely on detailed, honest reviews to help me make my purchasing decisions so I hope this info is useful to others. I will continue to buy from Spartan.